New materials and designs enter the market every day. They have a great market potential needed for many applications. The future market for development and production of fibre reinforced composite materials (lightweight materials) is very promising, not only within advanced application such as aeronautics, but also in maritime industries, on modern ship vessels and in railway vehicles. As a result of this it is important to know the material properties and fire behaviour in order to ensure a high safety level [1].Materials are tested as “new” and un-aged, which means testing is performed on newly produced products and materials. Very little research has been done regarding fire performance of materials after aging [5].Accelerated ageing can be performed with different aspects and in numerous ways. One type of these can be called weathering and there are mainly four basic types of this ageing used for products and materials. They are: thermal ageing, exposure of high temperature during a selected time; moisture ageing, exposure of water or moisture; UV exposure, and radiation ageing. [5]These types of ageing can be performed in many ways and combinations. For example, thermal ageing can be performed at a selected temperature and time. But it can also be one part of a climate cycling were you have fixed periods with temperature exposure followed by moisture exposure and UV exposure. This cycle can be repeated a numerus of times [7].The degradation of composite materials and change in properties is slow at room temperature. It gets faster with increased temperature. Accelerated ageing is an intentional way to expose materials and products to a proper simulation of long-term usage. Within a few days, weeks or months the damage and degradation of the materials can occur, which normally would be after years in normal climate and after normal usage. Accelerated ageing can cause the material properties to get worse, and an undesirable loss of functionality may be evolved [4].The behavior and material properties of fibre reinforced composites, after exposure of aggressive environmental conditions, shows changes, compared to new materials. After exposure of moisture, the fibres may result in damage and the material structure might be changed. After exposure of moisture and high temperature the durability of the composite is reduced [2].The Arrhenius Rate Law of accelerated ageing can be used to correlate the time in ageing climate. A generalization, supported by the Arrhenius Rate Laws, is that for a reaction in room temperature, the reaction rate doubles every 10°C increase in temperature [6].The objective of this work is to gather the most common methods to perform accelerated ageing, to see the variations between the methods and within the method.